diff options
Diffstat (limited to 'src/minilogd.c')
| -rw-r--r-- | src/minilogd.c | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/src/minilogd.c b/src/minilogd.c deleted file mode 100644 index 453431dc..00000000 --- a/src/minilogd.c +++ /dev/null @@ -1,193 +0,0 @@ -/* minilogd.c - * - * A pale imitation of syslogd. Most notably, doesn't write anything - * anywhere except possibly back to syslogd. - * - * Copyright (c) 1999-2001 Red Hat, Inc. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, version 2, - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA - * - */ - -#include <errno.h> -#include <fcntl.h> -#include <signal.h> -#include <stdio.h> -#include <stdlib.h> -#include <syslog.h> -#include <unistd.h> - -#include <sys/poll.h> -#include <sys/socket.h> -#include <sys/stat.h> -#include <sys/un.h> - -static int we_own_log=0; -static char **buffer=NULL; -static int buflines=0; - -int debug; - -int recvsock; - -void alarm_handler(int x) { - alarm(0); - close(recvsock); - recvsock = -1; -} - -void freeBuffer() { - struct sockaddr_un addr; - int sock; - int x=0,conn; - - bzero(&addr,sizeof(addr)); - addr.sun_family = AF_LOCAL; - strncpy(addr.sun_path,_PATH_LOG,sizeof(addr.sun_path)-1); - /* wait for klogd to hit syslog */ - sleep(2); - sock = socket(AF_LOCAL, SOCK_DGRAM,0); - conn=connect(sock,(struct sockaddr *) &addr,sizeof(addr)); - while (x<buflines) { - if (!conn) write(sock,buffer[x],strlen(buffer[x])+1); - free(buffer[x]); - x++; - } -} - -void cleanup(int exitcode) { - /* If we own the log, unlink it before trying to free our buffer. - * Otherwise, sending the buffer to /dev/log doesn't make much sense.... */ - if (we_own_log) { - perror("wol"); - unlink(_PATH_LOG); - } - /* Don't try to free buffer if we were called from a signal handler */ - if (exitcode<=0) { - if (buffer) freeBuffer(); - exit(exitcode); - } else - exit(exitcode+128); -} - -void runDaemon(int sock) { - struct sockaddr_un addr; - int x,len,done=0; - int addrlen = sizeof(struct sockaddr_un); - char *message; - struct stat s1,s2; - struct pollfd pfds; - - daemon(0,-1); - /* try not to leave stale sockets lying around */ - /* Hopefully, we won't actually get any of these */ - signal(SIGHUP,cleanup); - signal(SIGINT,cleanup); - signal(SIGQUIT,cleanup); - signal(SIGILL,cleanup); - signal(SIGABRT,cleanup); - signal(SIGFPE,cleanup); - signal(SIGSEGV,cleanup); - signal(SIGPIPE,cleanup); - signal(SIGBUS,cleanup); - signal(SIGTERM,cleanup); - done = 0; - /* Get stat info on /dev/log so we can later check to make sure we - * still own it... */ - if (stat(_PATH_LOG,&s1) != 0) - memset(&s1, '\0', sizeof(struct stat)); - while (!done) { - pfds.fd = sock; - pfds.events = POLLIN|POLLPRI; - if ( ( (x=poll(&pfds,1,500))==-1) && errno !=EINTR) { - perror("poll"); - cleanup(-1); - } - if ( (x>0) && pfds.revents & (POLLIN | POLLPRI)) { - message = calloc(8192,sizeof(char)); - addrlen = sizeof(struct sockaddr_un); - recvsock = accept(sock,(struct sockaddr *) &addr, &addrlen); - if (recvsock == -1) - continue; - alarm(2); - signal(SIGALRM, alarm_handler); - len = recv(recvsock,message,8192,0); - alarm(0); - close(recvsock); - if (len>0) { - if (buflines < 200000) { - if (buffer) - buffer = realloc(buffer,(buflines+1)*sizeof(char *)); - else - buffer = malloc(sizeof(char *)); - message[strlen(message)]='\n'; - buffer[buflines]=message; - buflines++; - } - } - else { - recvsock=-1; - } - } - if ( (x>0) && ( pfds.revents & (POLLHUP | POLLNVAL)) ) - done = 1; - /* Check to see if syslogd's yanked our socket out from under us */ - if ( (stat(_PATH_LOG,&s2)!=0) || - (s1.st_ino != s2.st_ino ) || (s1.st_ctime != s2.st_ctime) || - (s1.st_mtime != s2.st_mtime) ) { - done = 1; - we_own_log = 0; - } - } - cleanup(0); -} - -int main(int argc, char **argv) { - struct sockaddr_un addr; - int sock; - int pid; - - /* option processing made simple... */ - if (argc>1) debug=1; - /* just in case */ - sock = open("/dev/null",O_RDWR); - dup2(sock,0); - dup2(sock,1); - dup2(sock,2); - close(sock); - - bzero(&addr, sizeof(addr)); - addr.sun_family = AF_LOCAL; - strncpy(addr.sun_path,_PATH_LOG,sizeof(addr.sun_path)-1); - sock = socket(AF_LOCAL, SOCK_STREAM,0); - unlink(_PATH_LOG); - /* Bind socket before forking, so we know if the server started */ - if (!bind(sock,(struct sockaddr *) &addr, sizeof(addr))) { - we_own_log = 1; - listen(sock,5); - if ((pid=fork())==-1) { - perror("fork"); - exit(3); - } - if (pid) { - exit(0); - } else { - runDaemon(sock); - /* shouldn't get back here... */ - exit(4); - } - } else { - exit(5); - } -} |